dynamic traffic channels

Neels Hofmeyr nhofmeyr at sysmocom.de
Tue Jul 5 09:57:35 UTC 2016

On Wed, Jun 29, 2016 at 07:37:33PM +0200, Harald Welte wrote:
> Hi Neels,
> On Tue, Jun 28, 2016 at 03:25:48PM +0200, Neels Hofmeyr wrote:
> > On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote:
> > > [translated from german]
> > > is it certain that we switch a channel to PDCH only when 
> > > gprs mode != none?
> I'm not sure if your response covers the question I raised.

I see, I mistook the 'gprs mode' for the internal TS flag whether GPRS is
currently active on a TCH_F_PDCH, but you mean the VTY config item.

> What if you have a openbsc.cfg with a bts that has 'gprs mode none' but
> still has a timeslot in GSM_PCHAN_TCH_F_PDCH mode?  The intended
> operation in that case is that it will be treated as a pure TCH/F, and
> no attempts to switch to PDCH are made.

Indeed, we would switch to PDCH anyway.  Aside from it being meaningless
to have GSM_PCHAN_TCH_F_PDCH time slots with 'gprs mode none', I agree
that we shouldn't send PDCH ACT in that case.

It's easy to work around: just configure TS as GSM_PCHAN_TCH_F. So I'm not
putting this high up on the todo list.


- Neels Hofmeyr <nhofmeyr at sysmocom.de>          http://www.sysmocom.de/
* sysmocom - systems for mobile communications GmbH
* Alt-Moabit 93
* 10559 Berlin, Germany
* Sitz / Registered office: Berlin, HRB 134158 B
* Geschäftsführer / Managing Directors: Harald Welte
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